I haven't tested this on Vista, but it's working on Windows 2000/XP:
There's a cheat in minesweeper to activate a pixel in the top left corner of your screen, when you move your mouse over the mine field the pixel will become black if there's a mine, otherwise the pixel will be white ...
Enough talking, let's try the cheat:
xyzzy and press SHIFT-ENTER, this will do the trick ...
The cheat is now activated :P
Enjoy :) :P !!